Planned Release Date: Dec 11, 2025

Mature Content Description

The developers describe the content like this:

All characters depicted are over the age of 20.
Content Warning! This game depicts: Violence, Sex Acts, Death, Amputation, Self-harm, Piercing, Interspecies Sex, Futanari.

About This Game

‼️This game contains violence, gore, and extreme content. Please read and play with caution.‼️

Unknown time. Unknown place.

The moment the nameless girl opens her eyes, her destiny is already set in motion. With no prayer nor blessing to guide her, she steps alone into a colossal ruin choked with deranged machines.

After unbearable despair and the unending cycle of slaughter, the wavering blue light of her will is shattered, stolen, and trampled again and again, yet she continues forward.

Between cruelty and salvation, the tolling of the Church’s bells cuts through the world, and as their maddening echo strips away the last restraints of flesh and mind, the world begins to shift.

In the depths of this nightmare, she sees it:

Two souls appear, reflections of each other's shadow.
"Are you ready to make the ultimate devotion?"

A dark fable of existence, annihilation, terror and pleasure

- CYAN BRAIN

CYAN BRAIN is a decadent sci-fi side-scrolling action-shooting game.. The game includes the following:

Visceral shooting action

Fear-inducing executions

Mountable heavy weapons

Full-screen animated cinematics

When you take damage in combat, your outfit will gradually tear. Successful attacks trigger random, realistic blood-splatter effects that make the action feel even more visceral. If an enemy defeats you, a unique execution animation will play, and you’ll receive a collectible Death Card upon your character’s demise.

Collectibles:

• weapons: 16

• Enemies & Traps: 32

• Execution & H-Animations: 34

• Death Cards: 36

• Full-Screen HCGs: 3

You can view them all in the in-game gallery!

Protagonist

CV: Momoka Kosuzu

A girl who has lost both her name and her memories. To fulfill the mission entrusted to her, she explores a vast ruined city while battling the many hostile entities created by the organization known as the Church: a group that once reshaped her body into a living weapon. Each fight sharpens her skills, strengthens her body, and leads her to new and powerful gear whose potential she gradually unlocks.

By following the memory fragments scattered throughout the map, she draws closer to the truth behind this devastated world. The companions she meets along the way give every step she takes through the ruins real meaning. In time, those connections will become the signposts guiding her toward the "end of fate" that awaits.

HS202

CV: Ryo Suzuki

A member of the Church's Hunting Squad, but... it seems she's gotten lost.

L

CV: Izumi Mikoshiba

A former researcher of the Convent. Before her death, she preserved her lingering consciousness inside a specialized device and entrusted a certain plan to the newly awakened protagonist.

M

CV: Yui Otokura

A mysterious girl who appeared within a strange domain. She speaks in a cold, mechanical, almost emotionless tone.

*The final version of the game will be uncensored. Store images are for promotional reference only.